Yongho Hong, Suri Park, Sangwook Han, Byungjick Kim
Department of Chemical Engineering, Soongsil University, Seoul 156-743, Korea
Abstract： A smart decontamination device is developed for small-size radioactiv e scrap metal (SSRSM) arisen from nuclear facilities. The abrasion pin in rotati ng magnetic field and ultrasonic wave cleaner are used for solving the problems of the second decontamination and high treatment cost. At first, the decontamina tion efficiency of each device is improved by upgrading the design. Optimal oper ating conditions are determined for each device. Next, both techniques are appli ed sequentially. Experimental results show that the efficiency of combined decon tamination device is higher than that of each device. With the use of the develo ped device, the various SSRSMs are decontaminated for 15 min treatment in magnet ic abrasion device and 15 min treatment in ultrasonic cleaning device. Decontami nation index ranges from 18 to 56. Absolute values of all decontaminated samples are below the background value.
Key words： radioactive scrap metal; decontamination; magnetic field; ultrasonic cleaning
CLD number： X771 Document code： A
Article ID： 1674-8042(2013)03-0302-05 doi： 10.3969/j.issn.1674-8042.2013.03.0 22
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